From your description of the symptoms, you have an injector going out... I'd drive it, and scrape up some coin for an injector. All the of the videos above are the same truck (Stinky), so you can see what a difference the injectors and their torque can make. There's your sound reference... and one more:

 

If you get a couple of buddies who want to learn and help, it is a good exercise to get under the valve covers and do that test to 50in/lbs that Rich told you to do. Every one of us was new to this at some point. How did we learn? Just like you are getting ready to, by doing it and asking lots of questions in the process. It sounds like you have the advantage of having a shop and the right tools, so go for it. You will have a better understanding of your truck, and a nice sense of accomplishment when you are finished. Win/win.

 

I took my vc off to see how everything was under their kuz i too have a lil noise and i seen that all my injectors were all AD even #8 so thats probably the noise i hear right?

 

The leading cause of cackle in #8 is air in fuel and/or the gray CPS. I did the fuel mods and swapped out the CPS, then #8 sat down and shut up like a good little stick.

 

My fuel mods-70 psi fpr spring,1\4" holes in banjo bolts for fuel rall, gutted fuel filter spout,walbro fuuel pump, and hitch mod. And for the CPS i have the black motorcraft, black international, and gray international but my truck seems to run better and use less fuel with the gray international CPS for some reason so thats whats in their now. My crackle is loud at grusing speeds and at idle, and the weird thing is i have all AD injectors with no long lead injector in #8 so i figured that was why it was so loud but it could be something else

 

Ah... that rodeo ride is for the hard-core stealth-seekers. I have a ninth stick and that gets used for swapping out suspects until things quiet down. My last victim was #7 - I now need to send the stick in for some behavior modification.

 

Thats cheating with the windows rolled up!

 

Is that how this works... roll down the window on a cold morning before starting? I yield... you're more manly than I.

 

That was a nice warm spring day. If I had a convertible I would have been cruising around with the top down.

 

Well if anything, its definitely getting worse. I'm definitely starting to hear the knock more often now, but still mostly only when in drive. It might be just a little bit louder but is starting to sound more like Rich's video of his worn out injector, I think. And I think I'm starting to hear something when driving now, it sounds sort of like the knock I hear, but not quite as loud, and like I said before only at lower RPM's like below 2000. I got a video of me driving it in the stock tune the other day with the windows up, just haven't gotten around to putting it up yet. Was just wondering if you guys thought it sounded funny or louder than normal.

Just a few things I noticed:

Rich and Snowseeker thanks for the videos! I would definitely have to say that mine sounds louder than both of yours, unless its just the way our cameras pick up the sound. I'll have to see what you guys think with my videos.

Like I said the engine is starting to sound louder, and I think I can hear something for sure now when driving. I also noticed that there is a definite difference between the stock tune and 75HP setting on the TS chip. The 75HP definitely makes the engine sound louder when driving and a little bit at idle, than stock. So this makes me think that there is a fuel pressure issue, or now that I think about it more, maybe even an oil pressure issue, with the chip asking for more out of the truck. Or could a worn out or loose injector cause the truck to sound louder with the chip turned up? Or is that just the nature of having a chip on the truck? I would guess not, but maybe I'm wrong.

And again when I got home today after at least a 30 min drive, I put the truck in park and heard the knock again. Then after idling for about a minute it went away, and even after revving it a little never heard it again.

Also the MPG's are still way down. The last tank was a mix between having the hubs locked and unlocked, but only a little 4x4 driving. The trip meter said 206 miles and I filled it up today with 24 gallons......

What does that equal????
.
.
.
about 8.58 MPG NOT GOOD!!! SOMESOMETHING'S WRONG! At least I think so. Just seems way too low to me. If it dropped to 11 or 12, maybe, in the winter I would say ok, but 8.5 just doesn't seem right. What do you guys think? Am I just overthinking it?

I also got another video of a few times I heard the knock. The second clip is when I had just got home after about a 15 minute drive from school. That's probably when I hear it the most is when I first pull in the driveway. Then you can still hear it as I drive up my driveway. The last clip is about a minute or so after the second one. Now you can't hear the knock, but the idle still doesn't quite sound right. Like its not as smooth and quiet as it could be. What'd ya guys think?


Thanks man. I think I'm definitely going to get a few buddies together and work on it, not mater what, to get some experience and learn a little. Yeah I'm going to keep driving it. It still drives fine so far, just has the knock sometimes. Mine isn't too far behind yours so I wouldn't be surprised if a few things were starting to wear out. I'll definitely keep you guys updated.

Finally got a chance to wash it today, haha. It looks pretty good and cleaned up pretty well. definitely looks a lot better than before.

Yeah that's what I'm starting to think Rich. I'll have to start saving up. Might just end up doing a whole new set, but it will be awhile before I can afford that. I'll have to figure out how many injectors are bad. And see how much and if the knock gets any worse, before I can afford that. Most likely I'll probably just end up replacing the ones that are bad. Thanks for the videos Rich, your truck definitely sounds nice and quiet.

Thanks Jason. That's definitely what I plan on doing. I really do want to learn as much about my truck as I can, and hopefully be able to do most of my own work on it. I think I'm going to go ahead and go under the valve covers and just check everything out. And then I can get some experience for if/when I need to do some repair or replacement work. I'll probably have a lot of questions, haha. Hope to get to work on it soon.

 

When you undertake this job, make a detail instructional video for us who will have to do the same in the future.

Ever since I listened to your first vid and then listened to Rich's, I seem to hear a knocking noise in my engine. I hope it's just my imagination.

 

Haha no problem, will do. I had planned on doing that anyways.

Well I hope you don't have an issue. How often do you hear the "knock". I only heard mine after or during driving and being in drive. It sounded fine at idle, but now might be starting to sound a little worse, but still don't hear the knock at idle. And when I hear the knock its pretty obvious, a lot different than just the truck idling.


Also I aired up my tires more yesterday, so we'll see if that helps the MPG's at all. What do you guys run in your tires? Mine are rated at a max of 80psi. I ended up putting 70 in the front and 55 in the rear's. All of them had somewhere in the 40's before. The rears looked pretty good, but the front's looked sort of flat, so I just went till they didn't look flat anymore. We'll see if it helps any. Can't tell if the ride changed at all, haven't driven it too much.

And nobody has said anything about it being something to do with the engine internally. Is it possible that it could be something like that? I doubt it, but it would be nice to eliminate that possibility for sure.

 

There is a subtle knock inherent in these trucks - it's usually loudest by the rear of the engine. A troublesome injector knock isn't "Oh... is that an injector knock?" It's anything from "Oh crap, so that's what Tugly was talking about." to "Oh my freaking gawd! Shut off the engine before it's a pile of chards and goo."

 

 

So Rich, or anybody else, anymore thoughts on what I posted, or the knock, or my MPG issue? Or do you guys need more info do diagnose it further?

Thanks for all your guy's help so far, was just wondering if anyone had any other ideas of what my problem could be. Is there any tests I could do try and diagnose further? I really wish I had an AE. Hopefully I can get my Uncle's basic scanner hooked up to it this week and see what it says, but I don't think it has the same capabilities of the AE. And I probably won't be able to get under the valve covers until at the earliest of next weekend.

Sorry hope I'm not offending anyone, was just getting curios and a little worried, since the thread sort of hit a stand still. Was just wondering if there was anything else I could do or if anybody had some more thoughts from what I posted the other day. I'm guessing I probably need to delve further into doing some tests and get some more info, to help you guys diagnose my issue.

Thanks a lot for all the help so far guys. I really appreciate it.